<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Pure CSS Color Pulsar</title>
    <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
    <div class="pulsar-stage" tabindex="0">
        <div class="layer"></div>
        <div class="layer"></div>
        <div class="layer"></div>
    </div>
    <div class="info">
        Pure CSS Color Pulsar: **Hover over the center** to see the effect accelerate!
    </div>
</body>
</html>